Usage History of 'firewalls'

The following chart shows how frequently 'firewalls' appeared in printed materials over time. For example, the word 'firewalls' occurred 2 times in books in 1726 and 28,681 times in 2008. From 1726 to 2008, the word 'firewalls' was used a total of 404,626 times in books scanned by Google. See Reference: Google Ngram project.

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